Optical-pickup coordinatometer
US4272676A · kind A · utility
9Cited by
0References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Nov 9, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup which performs the function of a light pen is capable of point detection of elastic waves propagated by electrochemical transducers in a direction parallel to the surface of a writing table. The table is constituted by a plate of refractive material placed within an optical polarizing cell which prevents emergence of incident radiation produced by a light source. The pickup receives that portion of the radiation which emerges from the cell by virtue of the birefringence induced within the plate by the elastic wave trains issuing from the transducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.